math whizzes- please verify or correct?

You have the right idea and the correct formula, but you have overlooked an important aspect, and that is how long it took the second effort TOTAL time.

rate of change = (present - Past) / Past x 100

Since the effort required additional time to produce the meal, the total time for the last effort must be used. (5 minutes + 3.5 minutes) = 8.5 total minutes

Now use that in you equation for percent of change:

(8.5 - 5) / 5 * 100 = ????

It's a confusing problem. It sort of looks like the 3.5 minutes is over and above the 5 normal minutes, so you'd have 3.5 / 5 = 0.7, 70% increase. But maybe not, it's not clear.

once you're on the unit circle, then the ordered pairs are in simple terms (cosx, sinx). cos 40 5 could nicely be got here across with a calculator, yet your answer isn't nicely suited. could desire to locate out what your instructor needs, yet generally, with unit circle parts, the instructor needs nicely suited solutions. that's why we generally memorize the unit circle parts. (they are able to be derived from the 40 5-40 5-ninety and 30-60-ninety suitable triangles, yet that's a distinctive lesson.) ok, so in quadrant a million, the ordered pair for the 40 5 degree attitude is (sqrt2/2, sqrt2/2). by way of fact this is on the unit circle (circle with radius = a million) the cosine is the 1st coordinate, sqrt2/2. (be conscious that the sine is likewise sqrt2/2) Pi/6 is yet another unit circle quantity which you would be wanting to memorize. Its ordered pair in quadrant a million is (sqrt3/2, a million/2) so cos Pi/6= first coordinate = sqrt 3/2. 240 is in quadrant 3. Draw the terminal area in quadrant 3 and then draw a perpendicular phase to the x-axis. this is named a reference attitude. degree it. (240-one hundred eighty=60) So cos 240° is the comparable as cos 60, aside from according to threat the sign. ordered pair is ( -a million/2, -sqrt3/2) so cos = -a million/2 wish this facilitates.

70% increase

5 X .7= 3.5

It's ambiguous.

What is the percentage of?

The time taken to make the burger, the amount of planning, the effort to make the burger.

If I were to do it, I would have done it the same way as you have.

It's not really clear.....